This has no fit all answer, but the first thing to take in consideration is which format is supported by the equipment you have or plan to use:

DVD-R is compatible with more players and older burners, but some programs and or burner allow bit setting on DVD+R discs. This makes the burned DVD to appear as a DVD-ROM to players which is the oldest format meaning DVD read only media. The first thing to do is read your manuals to see what formats are supported, but remember formats can be added with firmware update so use Google or another search engine to find info and updates of your burner on the web. Also this link contains a ton of info: